I generally like sashing, but in this case, I like it better without. The important question is what you daughter will prefer.

I like it without as I like the secondary pattern you get with d9p.

I would have to agree. For me the white sashing is to stark of a contrast and I really like the secondary pattern that you get without sashing.

I like it better without the sashing

With sashing.
To my eyes, the design morphs to modern with the white sashing. And it works since you have a fair amt of white in the blocks. With the white, it's more clean and fresh; without the white, it's more cozy and mysterious.
So...which way does your daughter's taste go?

I like it with the sashing.

I like the sashing.

I like it both ways, too.

In my mind, it depends on how you will quilt it. I like to see a block treatment with SID when there are sashes, and an overall treatment when there aren't sashes.

And another consideration is how it will be laundered....

But the best consideration is which one your daughter will like better! :-D

both will work, but i prefer the sashing

I like it with the sashing